title: [Disappearance of coronary collateral circulation during a crisis of spontaneous angina. The role of spasm].
abstract: Disappearance of the collateral coronary circulation was observed during an attack of spontaneous angina. During coronary angiography, the patient developed precordial pain, ST depression in Leads I, II, III, AVL, AVF, and V2 to V6. The two coronary arteries were opacified: there was no change in the left coronary tree but the collateral circulation arising from the right coronary artery and revascularising the obstructed left anterior descending artery the ECG reverted to its previous state and the collateral circulation reappeared. This case suggests that coronary artery spasm may lead to disappearance of the collateral circulation. It raises problems of methodology in the demonstration of spastic phenomena and emphasises the role of the collateral circulation in the genesis of ischaemia. It is another illustration of coronary artery spasm accompanied by ST depression.
mesh_terms: D000788:Angina Pectoris, Variant / Q000175:diagnosis*; D003097:Collateral Circulation / Q000187:drug effects; D017023:Coronary Angiography; D003326:Coronary Circulation / Q000187:drug effects; D003329:Coronary Vasospasm / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin / Q000627:therapeutic use
chemical_list: D005996:Nitroglycerin
vernacular_title: Disparition de la circulation collatérale coronarienne au cours d'une crise d'angor spontané. Rôle du spasme.